The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 22, 1977
Filed:
Oct. 20, 1975
David Geller, Chicago, IL (US);
Wico Corporation, Niles, IL (US);
Abstract
An electronic door lock has a lockbolt operable between locked and unlocked positions by an electrically energizable bolt mover which is responsive to an electronic locking circuit and an electronic unlocking circuit. A switch actuates the electronic unlocking when the door is to be opened. A control circuit, also responsive to the switch, generates a control signal which is time-delayed by at least a predetermined interval after the actuation of the unlocking circuit. The locking circuit responds to the control signal by energizing the bolt mover so as to move the lockbolt to the locked position, thereby causing the door to be automatically locked after at least the predetermined interval following the unlocking of the door.